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Securities - Amortized Cost and Estimated Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Total, Face Amount	$ 450,548	$ 522,391
Total, Amortized Cost	441,939	514,599
Total, Gross Unrealized Gain	1,833	292
Total, Gross Unrealized Loss	(36,151)	(37,463)
Total, Carrying Value/Estimated Fair Value	407,621	477,428
Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Held to Maturity, Face Amount	145,780	146,530
Held to Maturity, Amortized Cost	145,780	146,352
Held to Maturity, Gross Unrealized Gain	0	0
Held to Maturity, Gross Unrealized Loss	0	0
Held to Maturity, Carrying Value/Estimated Fair Value	145,780	146,352
Commercial Mortgage Backed Securities [Member] | Estimated Fair Value [Member] | Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value Option, Face Amount	304,768	375,861
Fair Value Option, Amortized Cost	296,159	368,247
Fair Value Option, Gross Unrealized Gain	1,833	292
Fair Value Option, Gross Unrealized Loss	(36,151)	(37,463)
Fair Value Option, Carrying Value/Estimated Fair Value	$ 261,841	$ 331,076

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Available-for-sale Debt Securities, Face Amount

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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